Cita APA (7a ed.)

Gray, P. (1961). The Encyclopedia of the biological sciences. Reinhold Publishing Corporation.

Cita Chicago Style (17a ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. New York: Reinhold Publishing Corporation, 1961.

Cita MLA (9a ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. Reinhold Publishing Corporation, 1961.